Like Jupiter, Saturn gives out more energy than it receives from the Sun. But unlike Jupiter, much of Saturn's excess energy comes from
A) the Kelvin-Helmholtz mechanism.
B) radioactivity.
C) friction among the ring particles.
D) helium rain.

Question

Quizplus · Accepted Answer

Saturn's excess energy is significantly attributed to the phenomenon of "helium rain." This process involves helium droplets forming in the planet's hydrogen atmosphere and then falling deeper into the atmosphere. As these droplets descend, they release gravitational potential energy as heat, contributing to the excess energy emitted by Saturn. This process is distinct from the Kelvin-Helmholtz mechanism, which is more about the overall contraction of the planet, and is not primarily related to radioactivity or friction among ring particles.

Like Jupiter, Saturn Gives Out More Energy Than It Receives